For Mazda RX8 Silver-Coated Aluminum Cold Air Intake Pipe+6" H Blue Filter Helps Engine to Draw in More and Colder Air Resulting in Better Throttle Response and Higher Explosive Horsepower Output Improves Up To 95% Filtration Efficiency, Increase 5 to 10 Horsepower, 6 to 8 Precent of Torque, and Improve the Gas Mileage 3.5" Diameter Piping / Filter Dimension: 6" (Diameter) x 6" (Height) Come with Intake Pipe, Air Filter, Maf Adapter and Set of Hoses, Clamps and Mounting Hardware Fit 04-11 Mazda RX-8 (Installation Instruction is NOT Included, Prefessional Installer is Hightly Recommended)